Antenna structure and wireless communication device empolying same

Abstract

An antenna structure includes a main antenna and a diversity antenna spaced apart from the main antenna. The main antenna extends in a main antenna radiation direction. The diversity antenna includes a first radiation portion extending in a first radiation direction and a second radiation portion extending in a second radiation direction, the first radiation direction is substantially perpendicular to either the second radiation direction or an the main antenna radiation direction.

What is claimed is: 
     
         1 . An antenna structure, comprising:
 a main antenna extending in a main antenna radiation direction; and   a diversity antenna spaced apart from the main antenna, the diversity antenna having a first radiation portion extending in a first radiation direction and a second radiation portion extending in a second radiation direction, wherein the first radiation direction is substantially perpendicular to either the second radiation direction or the main antenna radiation direction.   
     
     
         2 . The antenna structure of  claim 1 , wherein the main antenna comprises a first grounding arm, a first feeding arm, and a first connecting arm connected between the first grounding arm and the first feeding arm; the diversity antenna comprises a second grounding arm, a second feeding arm, and a second connecting arm connected between the second feeding arm and the second grounding arm; the first connecting arm is perpendicular to the second connecting arm. 
     
     
         3 . The antenna structure of  claim 2 , wherein the main antenna further comprises a first branch, a second branch, and a third branch, all of which extend from the first feeding arm; when a current signal is fed to the first feeding arm, a first current path is formed on the first branch to generate a resonate mode at a first low frequency band, a second current path is formed on the second branch to generate a resonate mode at a first high frequency band, and a third current path is formed on the third branch to generate a resonate mode at a second high frequency band. 
     
     
         4 . The antenna structure of  claim 3 , wherein all of the first branch, the second branch, and the third branch are metallic meander strips. 
     
     
         5 . The antenna structure of  claim 3 , wherein the first branch comprises a first radiating arm, a second radiating arm, and a third radiating arm, all of which are connected in series and are coplanar with each other; the first radiating arm substantially perpendicularly extends from the first connecting arm away from the first feeding arm; the third radiating arm is substantially a L-shaped strip; the third radiating arm substantially perpendicularly extends from an end of the second radiating arm, and then perpendicularly extends towards the first radiating arm to be parallel with the first connecting arm. 
     
     
         6 . The antenna structure of  claim 3 , wherein the second branch comprises a fourth radiating arm and a fifth radiating arm connecting to the fourth radiating arm, the fourth radiating arm extends from a junction between the first connecting arm and the first feeding arm away from the first connecting arm; the fifth radiating arm is a substantially U-shaped strip; the fifth radiating arm and the first branch are positioned at the same side of the first connecting arm. 
     
     
         7 . The antenna structure of  claim 5 , wherein the third branch shares the first radiating arm with the first branch, and further comprises a sixth radiating arm and a seventh radiating arm extending from the sixth radiating arm; the sixth radiating arm extends from a distal end of the first radiating arm; the seventh radiating arm is a substantially L-shaped strip. 
     
     
         8 . The antenna structure of  claim 2 , therein the first radiating portion and the second radiating portion both are metallic meander strips, and both extends from the second feeding arm; when a current signal is fed to the feeding arm, a first current path is formed on the first radiating portion to generate a resonate mode to receive/send wireless signals at a low-frequency band; and a second current path is formed on the second radiating portion to generate a resonate mode to receive/send wireless signals at a high-frequency band. 
     
     
         9 . The antenna structure of  claim 8 , wherein the first radiating portion comprise a first resonating arm, and a second resonating arm; the first resonating arm is a substantially L-shaped strip, the first resonating arm extends from a junction between the second feeding arm and the second connecting arm to be substantially perpendicular to the second connecting arm, and then perpendicularly extends to be parallel with the second connecting arm; the second resonating arm substantially perpendicularly extends from a distal end of the first resonating arm. 
     
     
         10 . A wireless communication device, comprising:
 a printed circuit board (PCB) comprising a first side, a second side parallel to the first side, and a third side perpendicularly connected between the first side and the second side; and   an antenna structure mounted on the PCB, the antenna structure comprising:
 a main antenna positioned along the first side and extending in a main antenna radiation direction; and 
 a diversity antenna spaced apart from the main antenna, wherein the diversity antenna having a first radiation portion and a second radiation portion, the first radiation portion positioned along the third side and extending in a first radiating direction, the second radiation portion positioned along the second side and extending along a second radiation direction, wherein the first radiation direction is substantially perpendicular to either the second radiation directing or an the main antenna radiation direction. 
   
     
     
         11 . The wireless communication device of  claim 10 , wherein the main antenna comprises a first grounding arm, a first feeding arm, and a first connecting arm connected between the first grounding arm and the first feeding arm; the diversity antenna comprises a second grounding arm, a second feeding arm, and a second connecting arm connected between the second feeding arm and the second grounding arm; the first connecting arm is perpendicular to the second connecting arm. 
     
     
         12 . The wireless communication device of  claim 11 , wherein the main antenna further comprises a first branch, a second branch, and a third branch, all of which extend from the first feeding arm; when a current signal is fed to the first feeding arm, a first current path is formed on the first branch to generate a resonate mode at a first low frequency band, a second current path is formed on the second branch to generate a resonate mode at a first high frequency band, and a third current path is formed on the third branch to generate a resonate mode at a second high frequency band. 
     
     
         13 . The wireless communication device of  claim 12 , wherein all of the first branch, the second branch, and the third branch are metallic meander strips. 
     
     
         14 . The wireless communication device of  claim 12 , wherein the first branch comprises a first radiating arm, a second radiating arm, and a third radiating arm, all of which are connected in series and are coplanar with each other; the first radiating arm substantially perpendicularly extends from the first connecting arm away from the first feeding arm; the third radiating arm is substantially a L-shaped strip; the third radiating arm substantially perpendicularly extends from an end of the second radiating arm, and then perpendicularly extends towards the first radiating arm to be parallel with the first connecting arm. 
     
     
         15 . The wireless communication device of  claim 12 , wherein the second branch comprises a fourth radiating arm and a fifth radiating arm connecting to the fourth radiating arm, the fourth radiating arm extends from a junction between the first connecting arm and the first feeding arm away from the first connecting arm; the fifth radiating arm is a substantially U-shaped strip; the fifth radiating arm and the first branch are positioned at the same side of the first connecting arm. 
     
     
         16 . The wireless communication device of  claim 14 , wherein the third branch shares the first radiating arm with the first branch, and further comprises a sixth radiating arm and a seventh radiating arm extending from the sixth radiating arm; the sixth radiating arm extends from a distal end of the first radiating arm; the seventh radiating arm is a substantially L-shaped strip. 
     
     
         17 . The wireless communication device of  claim 11 , therein the first radiating portion and the second radiating portion both are metallic meander strips, and both extends from the second feeding arm; when a current signal is fed to the feeding arm, a first current path is formed on the first radiating portion to generate a resonate mode to receive/send wireless signals at a low-frequency band; and a second current path is formed on the second radiating portion to generate a resonate mode to receive/send wireless signals at a high-frequency band. 
     
     
         18 . The wireless communication device of  claim 17 , wherein the first radiating portion comprise a first resonating arm, and a second resonating arm; the first resonating arm is a substantially L-shaped strip, the first resonating arm extends from a junction between the second feeding arm and the second connecting arm to be substantially perpendicular to the second connecting arm, and then perpendicularly extends to be parallel with the second connecting arm; the second resonating arm substantially perpendicularly extends from a distal end of the first resonating arm.